linux-kernel - Re: [PATCH 2/2] xen/x86: Implement x86_apic

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Date:	Wed, 11 Apr 2012 12:49:02 +0800
From:	Lin Ming <mlin@...pku.edu.cn>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	mingo@...e.hu, suresh.b.siddha@...el.com, jwboyer@...hat.com,
	hpa@...or.com, yinghai@...nel.org, linux-kernel@...r.kernel.org,
	xiantao.zhang@...el.com
Subject: Re: [PATCH 2/2] xen/x86: Implement x86_apic_ops

On Thu, Mar 29, 2012 at 1:37 AM, Konrad Rzeszutek Wilk
<konrad.wilk@...cle.com> wrote:
> Or rather just implement one different function as opposed
> to the native one : the read function.
>
> We synthesize the values.
>
> Acked-by:  Suresh Siddha <suresh.b.siddha@...el.com>
> [v1: Rebased on top of tip/x86/urgent]
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> ---
>  arch/x86/xen/Makefile    |    2 +-
>  arch/x86/xen/apic.c      |   17 +++++++++++++++++
>  arch/x86/xen/enlighten.c |    2 ++
>  arch/x86/xen/xen-ops.h   |    4 ++++
>  4 files changed, 24 insertions(+), 1 deletions(-)
>  create mode 100644 arch/x86/xen/apic.c
>
> diff --git a/arch/x86/xen/Makefile b/arch/x86/xen/Makefile
> index add2c2d..96ab2c0 100644
> --- a/arch/x86/xen/Makefile
> +++ b/arch/x86/xen/Makefile
> @@ -20,5 +20,5 @@ obj-$(CONFIG_EVENT_TRACING) += trace.o
>  obj-$(CONFIG_SMP)              += smp.o
>  obj-$(CONFIG_PARAVIRT_SPINLOCKS)+= spinlock.o
>  obj-$(CONFIG_XEN_DEBUG_FS)     += debugfs.o
> -obj-$(CONFIG_XEN_DOM0)         += vga.o
> +obj-$(CONFIG_XEN_DOM0)         += apic.o vga.o
>  obj-$(CONFIG_SWIOTLB_XEN)      += pci-swiotlb-xen.o
> diff --git a/arch/x86/xen/apic.c b/arch/x86/xen/apic.c
> new file mode 100644
> index 0000000..aee16ab
> --- /dev/null
> +++ b/arch/x86/xen/apic.c
> @@ -0,0 +1,17 @@
> +#include <linux/init.h>
> +#include <asm/x86_init.h>
> +
> +unsigned int xen_io_apic_read(unsigned apic, unsigned reg)
> +{
> +       if (reg == 0x1)
> +               return 0x00170020;
> +       else if (reg == 0x0)
> +               return apic << 24;

Why is fixed value returned?

Can't we implement it with hypercall(PHYSDEVOP_apic_read)?

Lin Ming

> +
> +       return 0xff;
> +}
> +
> +void __init xen_init_apic(void)
> +{
> +       x86_io_apic_ops.read = xen_io_apic_read;
> +}
> diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
> index 4172af8..a7df080 100644
> --- a/arch/x86/xen/enlighten.c
> +++ b/arch/x86/xen/enlighten.c
> @@ -1271,6 +1271,8 @@ asmlinkage void __init xen_start_kernel(void)
>                xen_start_info->console.domU.mfn = 0;
>                xen_start_info->console.domU.evtchn = 0;
>
> +               xen_init_apic();
> +
>                /* Make sure ACS will be enabled */
>                pci_request_acs();
>        }
> diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
> index b095739..45c0c06 100644
> --- a/arch/x86/xen/xen-ops.h
> +++ b/arch/x86/xen/xen-ops.h
> @@ -92,11 +92,15 @@ struct dom0_vga_console_info;
>
>  #ifdef CONFIG_XEN_DOM0
>  void __init xen_init_vga(const struct dom0_vga_console_info *, size_t size);
> +void __init xen_init_apic(void);
>  #else
>  static inline void __init xen_init_vga(const struct dom0_vga_console_info *info,
>                                       size_t size)
>  {
>  }
> +static inline void __init xen_init_apic(void)
> +{
> +}
>  #endif
>
>  /* Declare an asm function, along with symbols needed to make it
> --
> 1.7.7.5
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